package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;
    /*
      service 做什么
        1: 解析出code授权码
        找微信 发送校验请求
        https://api.weixin.qq.com/sns/jscode2session  get
        参数
         appid  secret  从 weChatProperties 获取
         js_code  userLoginDTO获取
         grant_type authorization_code
       2:结果---json里面有openid就算成功  openid是null 没有就是失败
           {
                "session_key": "l3YGHGkZnKkupxmcuUA5GQ==",
                "openid": "o1ybQ6rjMYEJa508hN_JzdZNjk08"
            }
           {
                "errcode": 40029,
                "errmsg": "invalid code, rid: 671b478d-57513cef-2c823d24"
            }
       3:失败--抛出异常 --- 自定义异常LoginFailedException
       4:校验成功 有 openId了
          根据openid去数据库查询 用户信息
          查到 User 不是null 已经有了  有id 有openid
          没查到 User null 新用户 设置openid 完成新增 回显主键 因为要id
      5: 最终返回user对象
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 1：解析出code授权码
        String code = userLoginDTO.getCode();
        //请求路径
        String url = "https://api.weixin.qq.com/sns/jscode2session";
        //请求参数 map集合
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        //发请求
        String json = HttpClientUtil.doGet(url, map);
        //json字符串数据
        JSONObject jsonObject = JSON.parseObject(json);
        //获取openid
        String openid = jsonObject.getString("openid");
        //3:校验失败 抛出异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //4:校验成功 有 openId了
        //4.1 根据openId查询 user表
        User user = userMapper.getByOpenId(openid);

        //4.2 如果是null
        if(user==null){//得新增
            user = new User();
            user.setOpenid(openid);
            user.setCreateTime(LocalDateTime.now());
            userMapper.insert(user);
        }

        return user;
    }
}
